Aqueous liquid preparation containing 2-amino-3-(4-bromobenzoyl)phenylacetic acid

ABSTRACT

An aqueous liquid preparation of the present invention containing 2-amino-3-(4-bromobenzoyl)phenylacetic acid or its pharmacologically acceptable salt or a hydrate thereof, an alkyl aryl polyether alcohol type polymer such as tyloxapol, or a polyethylene glycol fatty acid ester such as polyethylene glycol monostearate is stable. Since even in the case where a preservative is incorporated into said aqueous liquid preparation, the preservative exhibits a sufficient preservative effect for a long time, said aqueous liquid preparation in the form of an eye drop is useful for the treatment of blepharitis, conjunctivitis, scleritis, and postoperative inflammation. Also, the aqueous liquid preparation of the present invention in the form of a nasal drop is useful for the treatment of allergic rhinitis and inflammatory rhinitis (e.g. chronic rhinitis, hypertrophic rhinitis, nasal polyp, etc.).

This is a divisional of Ser. No. 10/525,006, filed Mar. 28, 2005 nowU.S. Pat. No. 8,129,431, which is a U.S. national stage of InternationalApplication No. PCT/JP2004/000350 filed Jan. 16, 2004.

TECHNICAL FIELD

The present invention relates to an aqueous liquid preparationcontaining 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof. Moreparticularly, the present invention relates to an aqueous liquidpreparation containing 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof and analkyl aryl polyether alcohol type polymer or a polyethylene glycol fattyacid ester.

BACKGROUND ART

Benzoylphenylacetic acid derivatives including bromfenac (generic name)of formula (I):

of which chemical name is 2-amino-3-(4-bromobenzoyl)phenylacetic acidare known as disclosed in JP-A-23052/1977 and its corresponding U.S.Pat. No. 4,045,576. 2-Amino-3-(4-bromobenzoyl)phenylacetic acid, itspharmacologically acceptable salt and a hydrate thereof are known as anon-steroidal anti-inflammatory agent, and they are effective againstinflammatory diseases of anterior or posterior segment of the eye, suchas blepharitis, conjunctivitis, scleritis, and postoperativeinflammation in the field of ophthalmology, and its sodium salt has beenpractically used in the form of eye drops (“New Drugs in Japan, 2001”,2001 Edition, Published by Yakuji Nippo Ltd., May 11, 2001, p. 27-29).

The eye drop as mentioned above is designed to stabilize2-amino-3-(4-bromobenzoyl)phenylacetic acid by means of addition of awater-soluble polymer (e.g. polyvinylpyrrolidone, polyvinyl alcohol,etc.) and a sulfite (e.g. sodium sulfite, potassium sulfite, etc.)(Japanese patent No. 2,683,676 and its corresponding U.S. Pat. No.4,910,225).

In addition, as an eye drop other than the above-mentioned one, Japanesepatent No. 2,954,356 (corresponding to U.S. Pat. Nos. 5,603,929 and5,653,972) discloses a stable ophthalmic composition which comprisesincorporating an antibacterial quaternary ammonium polymer and boricacid into an acidic ophthalmic agent. The acidic agent described thereinincludes, for example, 2-amino-3-(4-bromobenzoyl)phenylacetic acid.

Further, in Japanese patent No. 2,954,356, there is the followingdescription—“Benzalkonium chloride is a widely used preservative inophthalmic solutions. However, benzalkonium chloride and otherquaternary ammonium compounds are generally considered to beincompatible with ophthalmic compositions of drugs with acidic groups,such as nonsteroidal anti-inflammatory drugs. These preservatives losetheir ability to function as they form complexes with the charged drugcompounds”.

In these prior art references, there is no disclosure that alkyl arylpolyether alcohol type polymers or polyethylene glycol fatty acid estersare able to stabilize an aqueous liquid preparation of2-amino-3-(4-bromobenzoyl)phenylacetic acid or its pharmacologicallyacceptable salt, and inhibit decrease in preservative effect ofbenzalkonium chloride and other quaternary ammonium compounds.

DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide an aqueous liquidpreparation comprising 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof, which isstable within a pH range giving no irritation to eyes and in which, whena preservative such as benzalkonium chloride is incorporated therein,preservative effect of the preservative does not substantiallydeteriorate.

Another object of the invention is to provide a method for stabilizingan aqueous liquid preparation of 2-amino-3-(4-bromobenzoyl)phenylaceticacid or a pharmacologically acceptable salt thereof or a hydratethereof.

Further object of the invention is to provide an aqueous liquidpreparation comprising 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof and apreservative, wherein, when specifically a quaternary ammonium salt suchas benzalkonium chloride is incorporated as a preservative, decrease inpreservative effect of said preservative is inhibited.

As a result of various studies, the inventors of the present inventionhave found that, by adding, for example, an alkyl aryl polyether alcoholtype polymer such as tyloxapol, or a polyethylene glycol fatty acidester such as polyethylene glycol monostearate to an aqueous liquidpreparation of 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof, theaqueous solution becomes stable within a pH range giving no irritationto eyes, and change of the 2-amino-3-(4-bromobenzoyl)phenylacetic acidover time can be inhibited, and furthermore, when the aqueous solutioncontains a preservative, deterioration in the preservative effect ofsaid preservative can be inhibited for a long period of time. Theinventors of the present invention have further studied extensively andcompleted the present invention.

Namely, the present invention relates to:

-   (1) An aqueous liquid preparation comprising    2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologically    acceptable salt thereof or a hydrate thereof, and an alkyl aryl    polyether alcohol type polymer or a polyethylene glycol fatty acid    ester,-   (2) The aqueous liquid preparation according to the above (1),    wherein the alkyl aryl polyether alcohol type polymer has a    polymerization degree of 3 to 10, the alkyl contains 1 to 18 carbon    atoms, the aryl is a phenyl residue, and the polyether alcohol is    represented by the formula O(CH₂CH₂O)_(x)H in which X is an integer    of 5 to 100,-   (3) The aqueous liquid preparation according to the above (1) or    (2), wherein the alkyl aryl polyether alcohol type polymer is    tyloxapol,-   (4) The aqueous liquid preparation according to the above (1),    wherein the carbon number of the fatty acid in the polyethylene    glycol fatty acid ester is 12 to 18,-   (5) The aqueous liquid preparation according to the above (1) or    (4), wherein the polyethylene glycol fatty acid ester is    polyethylene glycol monostearate,-   (6) The aqueous liquid preparation according to any one of the    above (1) to (3), wherein the concentration of the alkyl aryl    polyether alcohol type polymer is selected from a range of minimum    concentration of 0.01 w/v % to maximum concentration of 0.5 w/v %,-   (7) The aqueous liquid preparation according to any one of the above    (1), (2) or (4), wherein the concentration of the polyethylene    glycol fatty acid ester is selected from a range of minimum    concentration of 0.02 w/v % to maximum concentration of 0.1 w/v %,-   (8) The aqueous liquid preparation according to any one of the    above (1) to (7), wherein the concentration of the    2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologically    acceptable salt thereof or a hydrate thereof is 0.01 to 0.5 w/v %,-   (9) The aqueous liquid preparation according to any one of the    above (1) to (8), wherein benzalkonium chloride is contained as a    preservative,-   (10) The aqueous liquid preparation according to anyone of the    above (1) to (9), wherein the pharmacologically acceptable salt of    2-amino-3-(4-bromobenzoyl)phenylacetic acid is a sodium salt,-   (11) The aqueous liquid preparation according to any one of the    above (1) to (10), wherein the pH of the aqueous liquid preparation    is within a range of 7 to 9,-   (12) The aqueous liquid preparation according to the above (11),    wherein the pH of the aqueous liquid preparation is within a range    of 7.5 to 8.5,-   (13) The aqueous liquid preparation according to any one of the    above (1) to (12), wherein the aqueous liquid preparation is an eye    drop,-   (14) The aqueous liquid preparation according to any one of the    above (1) to (12), wherein the aqueous liquid preparation is a nasal    drop,-   (15) An eye drop comprising sodium    2-amino-3-(4-bromobenzoyl)phenylacetate hydrate and 0.01 to 0.5 w/v    % of tyloxapol,-   (16) An eye drop comprising sodium    2-amino-3-(4-bromobenzoyl)phenylacetate hydrate and 0.02 to 0.1 w/v    % of polyethylene glycol monostearate,-   (17) A method for stabilizing 2-amino-3-(4-bromobenzoyl)phenylacetic    acid or a pharmacologically acceptable salt thereof or a hydrate    thereof in an aqueous liquid preparation, which comprises    incorporating tyloxapol or polyethylene glycol monostearate into an    aqueous liquid preparation containing    2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologically    acceptable salt thereof or a hydrate thereof, and-   (18) A method for inhibiting decrease in preservative effect of a    preservative in an aqueous liquid preparation of    2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologically    acceptable salt thereof or a hydrate thereof, which comprises    incorporating tyloxapol or polyethylene glycol monostearate into an    aqueous liquid preparation containing    2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologically    acceptable salt thereof or a hydrate thereof and a preservative.

According to the present invention, a stable aqueous liquid preparationcontaining 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof can beprepared by incorporating an alkyl aryl polyether alcohol type polymersuch as tyloxapol, or a polyethylene glycol fatty acid ester such aspolyethylene glycol monostearate into an aqueous liquid preparationcontaining 2-amino-3-(4-bromobenzoyl)phenylacetic acid or apharmacologically acceptable salt thereof or a hydrate thereof. Also, anaqueous liquid preparation of the present invention, wherein apreservative is incorporated, has a sufficient preservative effect.

Therefore, the aqueous liquid preparation of the present invention isadvantageously used as an eye drop for the treatment of, for example,blepharitis, conjunctivitis, scleritis, and postoperative inflammation.In addition, such aqueous liquid preparation can be used as a nasal dropfor the treatment of, for example, allergic rhinitis and inflammatoryrhinitis (e.g. chronic rhinitis, hypertrophic rhinitis, nasal polyp,etc.).

The pharmacologically acceptable salt of2-amino-3-(4-bromobenzoyl)phenylacetic acid includes, for example, analkali metal salt such as sodium salt and potassium salt, and analkaline earth metal salt such as calcium salt and magnesium salt, amongwhich sodium salt is especially preferable.

2-Amino-3-(4-bromobenzoyl)phenylacetic acid and its pharmacologicallyacceptable salt can be prepared according to the method as described inJP-A-23052/1977 (corresponding to U.S. Pat. No. 4,045,576) or by asimilar method thereof. These compounds can be obtained as their hydratedepending on synthetic conditions and recrystallization conditions. Thehydrate includes 1/2 hydrate, 1 hydrate, and 3/2 hydrate, among which3/2 hydrate is preferable.

In the aqueous liquid preparation of the present invention, the content(concentration range) of 2-amino-3-(4-bromobenzoyl)phenylacetic acid ora pharmacologically acceptable salt thereof or a hydrate thereof isusually about 0.01 to 0.5 w/v %, preferably about 0.05 to 0.2 w/v %,especially about 0.1 w/v %, and it is preferable to appropriately varythe content depending on the purpose of use and the degree of disease tobe treated.

The carbon number of the alkyl in the an alkyl aryl polyether alcoholtype polymer which is a non-ionic surfactant used as a stabilizer for2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologicallyacceptable salt thereof or a hydrate thereof is approximately 1 to 18.Specifically, the alkyl group includes, for example, methyl, ethyl,propyl, isopropyl, cyclopropyl, butyl, isobutyl, sec-butyl, tert-butyl,cyclobutyl, pentyl, isopentyl, neopentyl, tert-pentyl, 1-ethylpropyl,4-methylpentyl, 1,1-dimethylbutyl, 2,2-dimethylbutyl, 1,2-dimethylbutyl,2-ethylbutyl, cyclopentyl, hexyl, cyclohexyl, heptyl, isoheptyl, octyl,isooctyl, nonyl, isononyl, decyl, isodecyl, undecyl, isoundecyl,dodecyl, isododecyl, tridecyl, isotridecyl, tetradecyl, isotetradecyl,pentadecyl, isopentadecyl, hexadecyl, isohexadecyl, heptadecyl,isoheptadecyl, octadecyl, isooctadecyl, and isomers thereof, among whichoctyl and its isomer (e.g. isooctyl, sec-octyl, 1-methylheptyl,1-ethylhexyl, 2-ethylhexyl, 1-propylpentyl, 1,5-dimethylhexyl,1,1,3,3-tetramethylbutyl, etc.) are preferable, and1,1,3,3-tetramethylbutyl which is an isomer of octyl groups isespecially preferable.

The aryl in the alkyl aryl polyether alcohol type polymer can bepreferably a phenyl residue. The polyether alcohol can be represented bythe formula O(CH₂CH₂O)_(x)H in which X is an integer of 5 to 100,preferably 5 to 30, more preferably 8 to 10. The average polymerizationdegree is preferably about 3 to 10.

Among the above-mentioned alkyl aryl polyether alcohol type polymers,tyloxapol having the following formula is especially preferable.

The fatty acid of the polyethylene glycol fatty acid ester which is anon-ionic surfactant used as a stabilizer for2-amino-3-(4-bromobenzoyl)phenylacetic acid or a pharmacologicallyacceptable salt thereof or a hydrate thereof can be preferably a fattyacid having the carbon number of 12 to 18. Specific examples of suchpolyethylene glycol fatty acid esters are polyethylene glycolmonostearate (e.g. polyoxyl 8 stearate, polyoxyl 40 stearate, etc.),polyethylene glycol monolaurate, polyethylene glycol monooleate,polyethylene glycol diisostearate, polyethylene glycol dilaurate,polyethylene glycol dioleate, and the like. Among these compounds,polyethylene glycol monostearate is preferable, and polyoxyl 40 stearateis especially preferable. The polyoxyl 40 stearate is a monostearic acidester of an ethylene oxide condensed polymer, and can be represented bythe formula C₁₇H₃₅COO(CH₂CH₂O)_(n)H which is a non-ionic surfactant andn is about 40.

Although the content (concentration range) of the alkyl aryl polyetheralcohol type polymer in the aqueous liquid preparation of the presentinvention depends on the kind of compounds used, the minimumconcentration is about 0.01 w/v and the maximum concentration is about0.5 w/v %. With respect to the tyloxapol content (concentration range),for example, the minimum content is about 0.01 w/v %, 0.02 w/v % or 0.03w/v %, and the maximum content is about 0.05 w/v %, 0.1 w/v %, 0.3 w/v %or 0.5% w/v, and preferably the minimum content is about 0.02 w/v % andthe maximum content is about 0.05 w/v %.

Although the content (concentration range) of the polyethylene glycolfatty acid ester in the aqueous liquid preparation of the presentinvention depends on the kind of compounds used, it is within a range ofabout 0.02 w/v % of minimum concentration to about 0.1 w/v % of maximumconcentration. For example, the content (concentration range) ofpolyethylene glycol monostearate is within a range of about 0.02 w/v %of minimum content to about 0.1 w/v of maximum content, and preferablywithin a range of about 0.02 w/v % of the minimum content to about 0.05w/v % of the maximum content.

The incorporation ratio of tyloxapol in the aqueous liquid preparationof the invention is within a range of the minimum content of about 0.1or 0.2 part by weight to the maximum content of about 0.5, 1, 3 or 5parts by weight, relative to 1 part by weight of2-amino-3-(4-bromobenzoyl)phenylacetic acid or its pharmacologicallyacceptable salt or a hydrate thereof.

The incorporation ratio of polyethylene glycol monostearate in theaqueous liquid preparation of the present invention is within a range ofthe minimum content of about 0.2 part by weight to the maximum contentof about 0.5 or 1 part by weight, relative to 1 part by weight of2-amino-3-(4-bromobenzoyl)phenylacetic acid or its pharmacologicallyacceptable salt or a hydrate thereof.

The preservative used in the present invention includes, for example,quaternary ammonium salts (e.g. benzalkonium chloride, benzethoniumchloride, etc.), chlorhexidine gluconate, and the like, among whichbenzalkonium chloride is especially preferable.

Further, so long as the purpose of the present invention is achieved,conventional various additives such as isotonics, buffers, thickners,stabilizers, chelating agents, pH controlling agents, perfumes and thelike may be appropriately added to the aqueous liquid preparation of thepresent invention. The isotonics include sodium chloride, potassiumchloride, glycerine, mannitol, sorbitol, boric acid, glucose, propyleneglycol and the like. The buffers include, for example, phosphate buffer,borate buffer, citrate buffer, tartarate buffer, acetate buffer, boricacid, borax, amino acids, and the like. The thickners includepolyvinylpyrrolidone, carboxymethylcellulose, carboxypropylcellulose,hydroxyethylcellulose, hydroxypropylcellulose,hydroxypropylmethylcellulose, polyvinyl alcohol, sodium polyacrylate,and the like. The stabilizers include sulfites such as sodium sulfiteand the like. The chelating agents include sodium edetate, sodiumcitrate, condensed sodium phosphate and the like. The pH controllingagents include hydrochloric acid, sodium hydroxide, phosphoric acid,acetic acid and the like. The perfumes include 1-menthol, borneol,camphor, Eucalyptus oil, and the like.

With respect to the concentrations of the above various additives in theaqueous liquid preparation of the present invention, the isotonic isincorporated into an osmotic pressure ratio of about 0.8 to 1.2, and theconcentrations of the buffer and the thickner to be added are about 0.01to 2 w/v % and 0.1 to 10 w/v %, respectively.

The pH of the aqueous liquid preparation of the present invention isadjusted to about 6 to 9, preferably about 7 to 9, especially about 7.5to 8.5.

So long as the purpose of the present invention is achieved, other sameor different kind of active ingredients may be appropriately added.

The aqueous liquid preparation of the present invention can be preparedby per se known method or according to the method as described in theJapanese Pharmacopoeia 14^(th) Edition, General Rules for Preparations,Solutions or Ophthalmic solutions.

The aqueous liquid preparation of the present invention can be appliedto warm-blooded animals such as human, rat, mouse, rabbit, cow, pig,dog, cat, and the like.

The aqueous liquid preparation of the present invention can be preparedeasily by dissolving the above-mentioned components in, for example,distilled water or sterile purified water. For example, the aqueousliquid preparation in the form of an eye drop can be used for thetreatment of inflammatory diseases in anterior or posterior segment ofthe eye such as blepharitis, conjunctivitis, scleritis, postoperativeinflammation, and the like. The dose of the aqueous liquid preparationcontaining 0.1 w/v % of sodium 2-amino-3-(4-bromobenzoyl)phenylacetatehydrate is, for example, administered to an adult 3 to 6 times daily inan amount of 1 to 2 drops per one time. Depending on the degree ofdiseases, frequency of dosing is appropriately controlled.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is illustrated by way of the followingExperimental Examples and Working Examples, but it is not restricted bythese Examples.

EXPERIMENTAL EXAMPLE 1 Stability Test of Sodium2-amino-3-(4-bromobenzoyl)phenylacetate

Four eye drops of sodium 2-amino-3-(4-bromobenzoyl)phenylacetatecomprising the components as shown in Table 1 were prepared, filledrespectively into a polypropylene container and subjected to stabilitytest at 60° C.

TABLE 1 Comparison Component Example 1 A-01 A-02 A-03 Sodium2-amino-3-(4- 0.1 g 0.1 g 0.1 g 0.1 g bromobenzoyl)phenyl- acetate Boricacid 1.5 g 1.5 g 1.5 g 1.5 g Benzalkonium chloride 0.005 g 0.005 g 0.005g 0.005 g Polysorbate 80 0.15 g — — — Polyoxyl 40 stearate — 0.15 g — —Tyloxapol — — 0.15 g 0.02 g Sterile purified water q.s. q.s. q.s. q.sTotal volume 100 mL 100 mL 100 mL 100 mL pH  7.0  7.0  7.0  7.0Remaining rate (%) at 51.3 63.7 73.8 89.6 60° C. after 4 weeks

The remaining rate (%) in the above Table 1 indicates values obtained bycorrecting moisture vaporization from the container. As is apparent fromthe Table 1, stability test was carried out under the conditions of pH7.0 at 60° C. for 4 weeks, and sodium2-amino-3-(4-bromobenzoyl)phenylacetate in each eye drop was stable inthe order of tyloxapol-containing preparation>polyoxyl 40stearate-containing preparation>polysorbate 80-containing preparation.

Further, with respect to eye drops containing tyloxapol (compositionsA-02 and A-03), sodium 2-amino-3-(4-bromobenzoyl)phenylacetate incomposition A-03 containing 0.02 w/v % of tyloxapol is more stable thanthat in composition A-02 containing 0.15 w/v % of tyloxapol.

EXPERIMENTAL EXAMPLE 2 Stability Test of Sodium2-amino-3-(4-bromobenzoyl)phenylacetate

Five eye drops of sodium 2-amino-3-(4-bromobenzoyl)phenylacetatecomprising the components as shown in Table 2 were prepared, filledrespectively into a polypropylene container and preserved at 60° C. for4 weeks, and then the content of 2-amino-3-(4-bromobenzoyl)phenylaceticacid and the pH in each eye drop were measured.

TABLE 2 Components A-04 A-05 A-06 A-07 A-08 Sodium 2-amino-3-(4- 0.1 g0.1 g 0.1 g 0.1 g 0.1 g bromobenzoyl)phenyl- acetate Boric acid 1.1 g1.1 g 1.1 g 1.1 g 1.1 g Borax 1.1 g 1.1 g 1.1 g 1.1 g 1.1 g Benzalkoniumchloride 0.005 g 0.005 g 0.005 g 0.005 g 0.005 g Polysorbate 80 — — — —— Tyloxapol 0.02 g 0.05 g 0.03 g — — Polyoxyl 40 stearate — — — 0.02 g0.05 g Polyvinyl- 2.0 g 2.0 g 2.0 g 2.0 g 1.0 g pyrrolidone (K-30)Sodium edetate 0.02 g 0.02 g 0.02 g 0.02 g 0.02 g Sodium hydroxide q.s.q.s. q.s. q.s. q.s. Sterile purified water q.s. q.s. q.s. q.s. q.s.Total volume 100 mL 100 mL 100 mL 100 mL 100 mL pH 8.17 8.16 8.15 8.198.19 60° C., Remaining 92.6  90.9  92.0  93.4  93.1  4 weeks rate (%) pH8.15 8.16 8.15 8.13 8.14

Table 2 shows the remaining rate and the pH of sodium2-amino-3-(4-bromobenzoyl)phenylacetate after storage at 60° C. for 4weeks, when the remaining rate of sodium2-amino-3-(4-bromobenzoyl)phenylacetate at the time of production of eyedrops is set to 100%. The remaining rate is a value obtained bycorrecting moisture vaporization from the container. As is apparent fromTable 2, the remaining rate of sodium2-amino-3-(4-bromobenzoyl)phenylacetate in the compositions A-04, A-05,A-06, A-07 and A-08 containing 0.02 w/v %, 0.03 w/v % and 0.05 w/v % oftyloxapol or 0.02 w/v % and 0.05 w/v % of polyoxyl 40 stearate is notless than 90% after storage at 60° C. for 4 weeks, which indicates thatthose compositions have sufficient stability for eye drops.

EXPERIMENTAL EXAMPLE 3 Preservative Effect Test of Aqueous LiquidPreparation Containing Sodium 2-amino-3-(4-bromobenzoyl)phenylacetate

Preservative effect test of compositions A-04, A-05 and A-07 ofExperimental Example 2 was carried out against Staphylococcus aureus(hereinafter referred to as S. aureus), Escherichia Coli (hereinafterreferred to as E. coli), Pseudomonas aeruginosa (hereinafter referred toas P. aeruginosa), Candida albicans (hereinafter referred to as C.albicans) and Aspergillus niger (hereinafter referred to as A. niger).

The results are shown in Tables 3-1, 3-2 and 3-3.

TABLE 3-1 Cell count (CFU/mL) Inoculum 6 hours after 24 hours after 7days after 14 days after 21 days after 28 days after A-04 countinoculation inoculation inoculation inoculation inoculation inoculationS. aureus 2.1 × 10⁶ 3.0 × 10¹ 0 0 0 0 0 E. coli 6.5 × 10⁶ 0 0 0 0 0 0 P.aeruginosa 5.8 × 10⁶ 0 0 0 0 0 0 C. albicans 3.2 × 10⁵ — — 0 0 0 0 A.niger 1.8 × 10⁵ — — 0 0 0 0

TABLE 3-2 Cell count (CFU/mL) Inoculum 6 hours after 24 hours after 7days after 14 days after 21 days after 28 days after A-05 countinoculation inoculation inoculation inoculation inoculation inoculationS. aureus 2.1 × 10⁶ 1.7 × 10⁵ 2.0 × 10¹ 0 0 0 0 E. coli 6.5 × 10⁶ 0 0 00 0 0 P. aeruginosa 5.8 × 10⁶ 0 0 0 0 0 0 C. albicans 3.2 × 10⁵ — — 0 00 0 A. niger 1.8 × 10⁵ — — 0 0 0 0

TABLE 3-3 Cell count (CFU/mL) Inoculum 6 hours after 24 hours after 7days after 14 days after 21 days after 28 days after A-07 countinoculation inoculation inoculation inoculation inoculation inoculationS. aureus 2.7 × 10⁶ 3.1 × 10⁴ 0 0 0 0 0 E. coli 7.4 × 10⁶ 0 0 0 0 0 0 P.aeruginosa 8.8 × 10⁶ 0 0 0 0 0 0 C. albicans 4.6 × 10⁵ — — 0 0 0 0 A.niger 1.0 × 10⁵ — — 0 0 0 0

As is apparent from Tables 3-1, 3-2 and 3-3, the preservative effect ofcomposition A-04 was found to be compatible with EP-criteria A inEuropean Pharmacopoeia (EP), and those of compositions A-05 and A-07were found to be compatible with EP-criteria B.

The EP-criteria A and EP-criteria B are given in the following.

EP-Criteria A:

Viable cell counts of bacteria (S. aureus, P. aeruginosa) 6 hours, 24hours, and 28 days after inoculation decrease to not more than 1/100,not more than 1/1000, and undetectable, respectively.

Viable cell count of fungi (C. albicans, A. niger) 7 hours afterinoculation decreases to not more than 1/100, and thereafter, the cellcount levels off or decreases.

EP-Criteria B

Viable cell counts of bacteria (S. aureus, P. aeruginosa) 24 hours and 7days after inoculation decrease to not more than 1/10 and not more than1/1000, respectively, and thereafter, the cell count levels off ordecreases.

Viable cell count of fungi (C. albicans, A. niger) 14 days afterinoculation decreases to not more than 1/10, and thereafter, the cellcount keeps the same level as that of 14 days after inoculation.

Example 1: Eye Drop Sodium 2-amino-3-(4- 0.1 gbromobenzoyl)phenylacetate 3/2 hydrate Boric acid 1.1 g Borax 1.1 gBenzalkonium chloride 0.005 g Tyloxapol 0.02 g Polyvinylpyrrolidone(K-30) 2.0 g Sodium edetate 0.02 g Sodium hydroxide q.s. Sterilepurified water to make total volume of 100 mL pH 8.17

An eye drop is prepared using the above components in a conventionalmanner.

Example 2: Eye Drop Sodium 2-amino-3-(4- 0.1 gbromobenzoyl)phenylacetate 3/2 hydrate Boric acid 1.1 g Borax 1.1 gBenzalkonium chloride 0.005 g Tyloxapol 0.05 g Polyvinylpyrrolidone(K-30) 2.0 g Sodium edetate 0.02 g Sodium hydroxide q.s. Sterilepurified water to make total volume of 100 mL pH 8.16

An eye drop is prepared using the above components in a conventionalmanner.

Example 3: Eye Drop Sodium 2-amino-3-(4- 0.1 gbromobenzoyl)phenylacetate 3/2 hydrate Boric acid 1.1 g Borax 1.1 gBenzalkonium chloride 0.005 g Polyoxyl 40 stearate 0.02 gPolyvinylpyrrolidone (K-30) 2.0 g Sodium edetate 0.02 g Sodium hydroxideq.s. Sterile purified water to make total volume of 100 mL pH 8.19

An eye drop is prepared using the above components in a conventionalmanner.

INDUSTRIAL APPLICABILITY

The aqueous liquid preparation of the present invention in the form ofeye drops is useful for the treatment of blepharitis, conjunctivitis,scleritis, and postoperative inflammation. Such preparation is alsouseful for the treatment of nasal drop for treatment of, for example,allergic rhinitis and inflammatory rhinitis (e.g. chronic rhinitis,hypertrophic rhinitis, nasal polyp, etc.)

The present application is based on application No. 12427/2003 filed inJapan, and includes the entire contents thereof. By reference, thereferences including patents and patent applications cited herein areincorporated in the present application at the same level as when theentire contents thereof are disclosed. Furthermore, since it is obviousthat the present invention can be carried out beyond the description ofthe above explanation and Working Examples, in light of the foregoingdescription, various other modifications and changes can be made to thepresent invention, and thus these modifications and changes should beconsidered to be within the scope of the claims appended hereto.

The invention claimed is:
 1. An aqueous liquid preparation comprising2-amino-3-(4-bromobenzoyl)phenylacetic acid or a sodium salt or ahydrate thereof, and polyoxyl 40 stearate, wherein the concentration ofthe polyoxyl 40 stearate is selected from a range of a minimumconcentration of 0.02 w/v % to a maximum concentration of 0.1 w/v %. 2.The aqueous liquid preparation according to claim 1, wherein theconcentration of the 2-amino-3-(4-bromobenzoyl)phenylacetic acid sodiumsalt or the hydrate thereof is 0.01 to 0.5 w/v %.
 3. The aqueous liquidpreparation according to claim 1, wherein benzalkonium chloride iscontained as a preservative.
 4. The aqueous liquid preparation accordingto claim 1, wherein the pH of the aqueous liquid preparation is within arange of 7 to
 9. 5. The aqueous liquid preparation according to claim 4,wherein the pH of the aqueous liquid preparation is within a range of7.5 to 8.5.
 6. The aqueous liquid preparation according to claim 1,wherein the aqueous liquid preparation is an eye drop.
 7. The aqueousliquid preparation according to claim 1, wherein the aqueous liquidpreparation is a nasal drop.
 8. An eye drop comprising sodium2-amino-3-(4-bromobenzoyl)phenylacetate hydrate and 0.02 to 0.1 w/v % ofpolyoxyl 40 stearate.
 9. A method for stabilizing2-amino-3-(4-bromobenzoyl)phenylacetic acid sodium salt or a hydratethereof in an aqueous liquid preparation, which comprises incorporatingpolyoxyl 40 stearate into an aqueous liquid preparation containing2-amino-3-(4-bromobenzoyl)phenylacetic acid sodium salt or a hydratethereof.
 10. A method for inhibiting decrease in preservative effect ofa preservative in an aqueous liquid preparation of2-amino-3-(4-bromobenzoyl)phenylacetic acid sodium salt or a hydratethereof, which comprises incorporating polyoxyl 40 stearate into anaqueous liquid preparation containing2-amino-3-(4-bromobenzoyl)phenylacetic acid sodium salt or a hydratethereof and a preservative.
 11. The aqueous liquid preparation accordingto claim 1, which consists essentially of the following two components,wherein the first component is the2-amino-3-(4-bromobenzoyl)phenylacetic acid sodium salt or the hydratethereof, and the second component is polyoxyl 40 stearate.
 12. Theaqueous liquid preparation according to claim 1, which is formulated forophthalmic administration.
 13. The aqueous liquid preparation accordingto claim 1, wherein when a quaternary ammonium compound is included insaid liquid preparation, the quaternary ammonium compound isbenzalkonium chloride.
 14. The aqueous liquid preparation according toclaim 1, which further includes one or more additives selected from thegroup consisting of a preservative, buffer, thickener, stabilizer,chelating agent, and pH controlling agent.
 15. The aqueous liquidpreparation according to claim 14, wherein said preservative isbenzalkonium chloride; wherein said buffer is boric acid and/or sodiumborate; wherein said thickener is polyvinylpyrrolidone; wherein saidstabilizer is sodium sulfite; wherein said chelating agent is sodiumedetate; and wherein said pH controlling agent is sodium hydroxide. 16.The aqueous liquid preparation according to claim 1, wherein theconcentration of the 2-amino-3-(4-bromobenzoyl)phenylacetic acid sodiumsalt is about 0.2 w/v %.
 17. The aqueous liquid preparation according toclaim 1, wherein the hydrate is at least one selected from a 1/2hydrate, 1 hydrate and 3/2 hydrate.